Can I just confirm with you Migz.
The Interim hearing on 27th February, does this precede mediation? If so and orders are made by the Court (consent or court determined) in terms of 'spends with' time arrangements then these orders will be what apply.
If further agreements are then reached in mediation, given it is early days and the matter will likely be still in Court (?), these agreements would not automatically override the interim court orders, unless they could for example be made into consent orders.
As an aside, to save any confusion, I made no reference to child support, just to an idea which could assist in your negotiations with the mother on those child care days, but in any event, it is good to hear you are on to it. Good luck with it all.